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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dbe8e058176ee021bac365efd2d8856c6928844303f31684cdbfad104a68c64' 
  AND token = 'z5aJLirKxT73HLLsPBD/B/q1HZbwqludlqNqN8usAIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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