Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83a88ae571d6b65602ab0374864dcb548ed80ef0ccddf93341cd657ade938d6' 
  AND token = 'LczSII4QhK24I1LDBidExBj3DTWq4KCqQEJLiXbKO8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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