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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f2ae8a9d911b12c819fb5c9774f8b520b71868fef2964ebeeaa5c6bf56e8a9' 
  AND token = 's37IFl/5wMeDSuOzwamtYfdZloLonKlLfpQ4/6z4pL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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