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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b557595fee51ae9dee186943e42d230eafc8944a031dbe49157089144e54ad' 
  AND token = '9ArRp0JiSIODkOwwmdmr+YvSBSHY/hhA1gBefYL/30g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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