SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b513d07db04a07afd66e2d0d82b27e5924c9637e4142a428999d5f7cce4b6b28' 
  AND token = '30I0qHispdTuZzzoxdgAUm0rR1JDKGJuxf4jLmIVUZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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