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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfad3fab9f2190ef1572988cea81d5c1af6a98e7162c829abb121a5f6bf21f0d' 
  AND token = 'TgD6vHuElQ921B1us8f/DbF+Cqm54azMMCj5sxZndqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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