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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c435b2e24eec59adb48096264d70f44d3bb969f04401c6d398bbfb2ae33ec1b' 
  AND token = 'hu1SffXHXrfjq8AUSOuQdkeFaTquOpWBnAhU5gWy1ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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