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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad82fcae23519cb61ca7363cb1819dc485fdac16cc15b9b5369ea3c8e60dd794' 
  AND token = 'yTjMhXW3AjTM4Xt2yoikElRkDePTqp9jKvUJD8bAu3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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