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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41740261c08b92c05d97ebabcdb173c4725a108baddc8b797e7408f01033575b' 
  AND token = 'X0nf9Wj7p4nGCEmCS3Un1SQ11ajByt3ZWuyKqm7MxKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}