SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f605c2c49e904da38573f85e60861faab922c572c4a444503b65152d1013e3' 
  AND token = 'HSjAz+YGrgCOVGF27U6LveDOXl3JI0Cht82myNz5G6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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