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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fecd957ed7f665a18be2acfa978c4399bdd601e21d406a64c32be9c52f1d5c00' 
  AND token = '8nckAYHfVy48H5q81x9sU6ZegoVjp0VeB7ljnqXjBso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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