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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030516781d51f6d4258ea0b4a01a285ef4e6e3d9d96f81b3ec04163b1d67afe5' 
  AND token = 'wOL9K21KtuoBrJCcvyvhabrVUUGITaTWRt4AxgxIZfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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