SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86ec611d0221db870383fc2e01eb7574f65d984fa5d31b8c9e742c1396d2375' 
  AND token = '5sgv+yxzYpG/+bCdX7sLl9BwuNdffYziNKqRJXOXEkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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