SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbcc41f865e2777c1d6dcbf196aeae42597ddd01a63abc53d85aaa02f048233c' 
  AND token = 'g5BzxATJ8whPYFFd6AOUuxdmsYnkZKBuRhRGp5qe1P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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