SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b9ce8d278edff553ad3041f978f6a2f8c461b0810c82405a7a71bbebf15ce5' 
  AND token = 'bYL4TzPGRjhLa7Xl2VDOZ62g17qdE3CwYUVNMougx/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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