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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9df9fc2bc30a39750c0c9eef6bd3d0f1ba9aeb786b6034cbbe7b6b1f29f22b0' 
  AND token = 'UjoHEwaWT0MylJRJD83QPeG9+33ZyF43c4d+T5q4zZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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