SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c411bdd40f83b3a841e1c5b1ad1fac1057b7b95991f3f1c53d42717adef3ac7' 
  AND token = '2+aHdYhPXq5hUlmI1gc3j+mRuZFoxAoUVmMNQFZVGqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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