SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96619bf1f89e8c6d5eaacad514772379bb98926795f668b751571a5e778accfc' 
  AND token = '6xlF6QFRgnPzuNBdAPflkKRVOcYrGkyh+u8JAHgLHXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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