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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5ac937b0870caac8f32738cf745897f23a1115513363b8e60c117df6795676' 
  AND token = 'qXSlw4agcf3JsI9tfxGoEjTkfCFnaZkcn/fpXJv7kOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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