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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19b75eab02efd95236689808b17f079973ddbb5e1b961f6c883ec2c8a7551b8' 
  AND token = 'guYN5DGqM5KVBaYeSZx1A4psf9BBWt65hScTCFwU9WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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