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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234bf48b85142ec7547dd2733194289c2f1330e7e5ae9f36b8c393cec1f13222' 
  AND token = 'cfxvqytpr/DKIzW0UrN8nrTD9RiNBjWpKAa2IiaP8/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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