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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33dcd812f701d7812e9e6db4f8bafdb753e4b2fbe4d6d312a40b11d68ac0ef6d' 
  AND token = 'gckZA8PdiURud3UJ0XBvEjOsIzZSzJeNJVWPXL/kxFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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