SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2e3c7b83f47ee2cdd6c4aadf98978e5edb9c8f98d8433a5affc32030704759' 
  AND token = 'oQJlZvZD64zRW6Pkkj6IFWblhsK2igIYhYX3MHR7g+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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