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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9e376b6f6c63c30c53a97f76e3bba559753555c4f5029c633283c2027b2568' 
  AND token = 'QvsGlzXlmhsEMTHeOtC6Nq7aYU6vnQYLBGrppaHwKFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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