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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '406190ad71034e167e64c42eec316b18347bb362ce50319cc0b01170c6930129' 
  AND token = 'Js8waXVfaXA2uNYIqdgmVKc+009PwV8ZMkXe2LUKfLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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