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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7fcf99a0fbf066fb56d7e81140b3b3457836872db2a565c190b3a7d5659855a' 
  AND token = 'WwW69Z9btZux5PwUMgCIWyyyBh10Gc4tTI7vBV5E+Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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