SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48469d0169fa0c6ea6df2abef5a0d774015896d4dc56acf3e9788b979e4c833' 
  AND token = 'aGwrhpHdeLzhvgEVASWnWNO4jYBGUCv8z9m57WR/KLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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