SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac656973e9c9c1c453403d70d5b5484baa255245ebf00864bf9c227f389129d3' 
  AND token = 'TR5UFBwaEKjYRPHGdxjq/Q36g536W39RzLmJN4GcXVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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