SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff3ab489201be038ff5e574b54708642eac0d4e4967acf50d4fbf24d5de3b49' 
  AND token = 'kV/lt+wGVNY6J66WTq4gAVQVJDu/huvpHbgWLTSQusM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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