SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f228e427827838a6d8936e5f5bb5c427fafd90401a528d578c5bb54088162c' 
  AND token = 'pgE/QFuhe9eKro2zATZ/jB2muKGTJoCaFpG9m7Jbn5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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