SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '872b8152f3ee6ce3e02c91841667be3c52594794feb6c0a85b8cbedb7054bd0d' 
  AND token = 'xv+Wv/QJuSIZ62B0u4zuwjCcEj9Mto1P2g1+FvwAhP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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