SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f7c22581c1e46c2e653eab4cf2476dd3c52057671a38ba9b3cf0c9d9d4b78a' 
  AND token = 'Jz+7lsO0BmNIw/giw5qLoZBA/RBPtqX0XLzE3KlQHcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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