SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa2669d61170c70a75456c3c2ca98b60d4d29fb92d0622c808b5b0dfeda6016' 
  AND token = 'g+yvxojWDGzVu2v2BoCXscLE8FapWqezU4w7ThjBUNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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