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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d9fb6fea75711b81528c879fa45c8b685325ac8e95af19a5d9e9d9f783fad3' 
  AND token = 'zJdU2yUmF965NBPliMQWDSe5WB/Su4gPc33U25dgog0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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