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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5cc4a8e4a00809e1d036d08741cf183082565e2595f5a83116b6ea690b9b72' 
  AND token = 'asSfQGp3gb+hwq+aLCkHbRnwPAtJAwJ7g8DNaQuhEjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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