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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16df992aaa65788b598766e847b7c096b8b7188812c0c83ed2f4b46f9fa41579' 
  AND token = 'zUd7JXybSrKPKMQOv0C8ZR9faevb3zOq+ILNtX+HHY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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