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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d8fc4fb2eab41d530aad016d8abd5764014d33c8809147698713faa7fd1db5' 
  AND token = 'EkZieg4L7hUF/Mw4j1Koo4wl6kIBVqFAfq9a2UHwGq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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