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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3eb2a9f2a7735060e2c87ebe97c7e18228440061f3f34273d4cba6d091885ce' 
  AND token = 'DSt3W0NnuE3pNb6o1J8nW9SU9EWWrOfpbBNgVRCBH5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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