SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439ae6e1d33659ec42eec140a005b1d64b7b2b3e063b231ab08088f093a453d5' 
  AND token = 'hapKFOwz8VGjY8rikKNJT7HqfhCwz+JYQqXkbXp3q9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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