SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed1890bfe40353a65d357e939e316b048ff8b154418b428e86702cc3aeddebf1' 
  AND token = '5J0QzSyvUKXrnDvBhm/Ni7N2nhzQ/aCdHGwhmE1rmqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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