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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93958c95c7d8399591e32d382c13dbb97690a06344f6cc8db43a42560880e99' 
  AND token = '9Ezw2eSSiMccQRi7ATnAOmial9MeLjtb6LC0XsKm+Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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