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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bedc9ab2c38abbb067c3cfe90025f3c7e86a6e24dd8ec24cc7f44f29c716a75' 
  AND token = 'fwrsUxFxytqjOGA3YucQpnW39lTocGaf/jOjKSU5SV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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