SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82833c6d852fcb6e0f2fb9c1195c13eca06eb165138026877a433d094d9872d' 
  AND token = '+nLxaHTuU6yo7E4uVUxQOA3vigQzXdts2gq4AjJRKeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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