SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3f485d978e52371e47c25ca418039beed2ee0215f11f35d6e316d890213fb0' 
  AND token = 'Pp2OAW+P1hMYgxUIgRlw7BJv56Ul4F9mwJC7X9gpUQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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