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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad49ba347a894f35437d0ad00ae416bbdfcd1e9dafb0b7ce8fe97ca834c2ac28' 
  AND token = 'UThdN9mBN4gBWBbX3O9VIzqO7PUr3oeD4vnJ9cQUtbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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