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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af81b238694b6d36ff36706fe0f8c3d2234848d951dca4e1b46a1ef58ecf72ec' 
  AND token = 'R9+s2RbkEHFrmQRVDbdDd9UJPQut6BSeXUoEA+3J0kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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