SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd678c402db65c8314700b5e0f758ab281f0cb0d5ae3a16415444932b61bf529a' 
  AND token = 'uGiKUCBsvfYy2ShO80kG7uCSmUmquSr60EQYXNZvp/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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