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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75fd78d0b58cfe628f5dfb287789533bf67f4da40486e1d97ac78e780043e28b' 
  AND token = 'R97La2pEN/W8aAEexiYR0nQ3Ufc/omCbKElkQvz7zE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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