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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '461b02ba5c9fd14022a79ece9b13971d7905f920e9e6432ddb377b6006f4dfde' 
  AND token = '6c8yCA732O4C1JD8a5QcuIzx+Jbqw+5/pjtq+atN/tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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