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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa631e44688cf5cc2feb90f33ef5be98ca959cb3a6f4ee722d7bad261a0391a' 
  AND token = 'qGGMAbMdNfMTIEHYbO+wjBYFGmk84hVtGj1jcyJrt/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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