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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6021fff3fb39bb6dc0be6fd37c7a43a1e8c27308eaa603ab3a08d0cf317f4cd6' 
  AND token = 'i3xImndgVfMDhkTcwVnQKHjaRoKW3JD2i598s7TACRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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