SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25c37f8ad8384a042b60e5bcb08f94458116b0a7ee1c2abca8f99bc1cba87e5' 
  AND token = 'Gz8BjtEjcFhCFTmtICmi1NMuLazpVwKXqwCzLrj/6yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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