SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dcbd11ddc734547c8c1415818464d3e186b4b64d333b5261609008442f3abe7' 
  AND token = '7UIvafAjwS9R7B8/lwPK9KJ+/2XfHg6dhxHpAXZUKNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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