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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db09152511de188abcc9550cded0002bdbb48c657c53771e957766a612d36cd' 
  AND token = 'UGAMSggvAjF7CLZHME01s1ob0ie0rClYpZo5fJ8mUz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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