SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54207f22cb941d3d4e3654d98de2ca4049e2749ab6f9f8075d5278d5760546bc' 
  AND token = 'fMOJV51vwJXs5a+KR3DLg/JZg7LfS3QAhKG3hB5YJK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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