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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ad051071d888d7aa9468f3bc7b7cf7ab45506e432e104a85993c3a960241f7' 
  AND token = '0wUPQCb24OyC6aB+UO7dAsXDpgt/wldh4G610jCUay0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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