Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c5195f1841215669cfab132eb02a949cad6e57622ab319275547d7a970056aa' 
  AND token = 'z3ztaK33735ByOxVqZ9+FuYI2myldFFFgLeXWAfKwtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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