SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d8b9933562c52a619c59d2d1ff915fd69419a1f12390c22bfe6b07ee61b36b' 
  AND token = 'PqwkTkQP4BWUJZUVaXwHUYAguJLeihZuXfukw+h4ryA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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