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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe6043d4d260db3e23d91d4d81273d41a37582f5b7bf447fb89a7d408f349f17' 
  AND token = 'm8jNSlRNTsrMLtw7hbRt98fess6WC0f9VtBU6WpocGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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