SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01de5681ebd71c7d9a9410dea9c730997116d7310d0295d7a3754afb22f85cb' 
  AND token = 'XytyRH+0RHUDu0ngypoX13X1/iMKRntZfG2qEOb+Lo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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