SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1222038712596881abce6212eb6daad9915b4d0dfb04f9d781601d8b1b7635b6' 
  AND token = 'CSTqAApZPGKpvBuaN/q5CB7UNgrKt/Mzqz/MQmxEqsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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