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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c5bb9fe69b8c5ddc691d2a40660a58455e01716cfb4f52c42e9b5458aa88c1' 
  AND token = '0XknlwR8RqijReK73z0UcnR5aDQtpD8CtSgLLhevfBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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