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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4097f454843e4bbf459521c4f2d45b34c9dcaaebeb7240d8e45888b4c4da98c' 
  AND token = 'nha5+GYpcGKD/9htUaqn3fmM5WM15wFodvJ69Q6SQ0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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