SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2045d3d08615bf805d5d2a18ce7bd6a9f977598f57fc502694fc6338b6338ac3' 
  AND token = 'NlQ2vvcUudEZTJxtFMKovnsXgUUxljIQCRSyFXx2EZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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