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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa63f4fda8ad7e55e247af362b9f3bcb8cd398e65797aef3fc9269491dea6c0' 
  AND token = '2skZtJuqP7yAJOrDyymxuwClo64vIT0xCXs7ZTpmqrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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