SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd862757976ecc6cfddd0cfb58b57351e73278b3a8c3b3fe31c519e793f55a5ec' 
  AND token = 'JW3IT9z1Ner37gD+S5c/KC/vKJmyjT13KtRyivu+AjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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